Post-doc and Funded PhD in Air-Sea Exchange

Post-doc: Characterising a New Gas Analyser for Eddy Covariance Measurements of Air-Sea Fluxes of Carbon Dioxide

Accurate measurements of atmosphere-ocean fluxes are important for quantifying the amount of greenhouse gases that are transferred across the air-sea interface. The eddy correlation (direct) method is considered to be the benchmark for accurate determination of air-sea fluxes. This method relies on high-frequency measurements of the fluctuations of vertical wind velocity (w’) and gas concentration (c’). Current gas analyser technology places constraints on the ability to determine c’ with the required signal-to-noise ratio, and measurements are limited to conditions of high air-sea fluxes.

The main objective of this project is to characterise a newly-developed photoacoustic gas analyser and implement it within an eddy-covariance system. This technology will provide a significant improvement in sensitivity over the IR absorption sensors that are currently in oceanographic use, and there is a very stong potential for reducing the scatter in the air-sea gas transfer coefficient.

Post-doctoral candidates should have completed a PhD in oceanography, atmospheric science, or a related field with a proven research record and evidence of high research potential. Familiarity with the eddy covariance flux method is exceedingly desirable. Experience with instrumentation is essential. Enthusiam for participation in ocean-going field experiments is necessary.

An annual salary of €38,286 is offered for an initial period of 12 months, with the possibility of a further extension. For more information, contact Dr. Brian Ward bward@nuigalway.ie.

Funded PhD Fellowship: Turbulence Measurements at the Ocean Surface for the SPURS Ocean Salinity Experiment

This project addresses the following question: What is the vertical distribution of small-scale temperature, salinity, dissipation, and velocity in the upper 100 m of the ocean, and how do these processes contribute to the North Atlantic Salinity Maximum?

The primary focus of this project is to study the small-scale processes at the ocean surface to quantify their impact on sea surface salinity using data from the Air-Sea Interaction Profiler (ASIP). ASIP is upwardly-rising profiler that has a suite of high-resolution sensors that can provide measurements from mixed-layer depths to the air-sea interface, including temperature, salinity, shear, velocity, and PAR. The shear measurements provide the level of turbulence, which is quantified by the dissipation rate of turbulent kinetic energy. This dissipation and temperature/salinity profiles are essential to determining the vertical turbulent fluxes of salt and temperature in a stratified system, which is the main mechanism of transport of these scalars. Because of the high spatial resolution of the salinity profiles, the sea surface salinity can be determined exactly and related to the bulk salinity and the turbulent fluxes.

Applicants should have a degree in physics, engineering, or a closely-related discipline, and a strong motivation for research. Familiarity with ocean turbulence is desirable but not essential. Experience with Matlab is essential. Enthusiam for participation in ocean-going field experiments is necessary. For further information, contact Dr. Brian Ward bward@nuigalway.ie.

Applications for both positions should be send to (curriculum vitae, motivation letter, references, research statement) should be sent by e-mail to Dr. Brian Ward: bward@nuigalway.ie

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